katex.less

/* stylelint-disable font-family-no-missing-generic-family-keyword */
@import "fonts.less";

// The mu unit is defined as 1/18 em
@mu: (1em / 18);

// The version is dynamically set from package.json via webpack.common.js
@version: "";

.katex {
    font: normal 1.21em KaTeX_Main, Times New Roman, serif;
    line-height: 1.2;

    // Protect elements inside .katex from inheriting text-indent.
    text-indent: 0;

    // Prevent a rendering bug that misplaces \vec in Chrome.
    text-rendering: auto;

    * {
        // Prevent background resetting on elements in Windows's high-contrast
        // mode, while still allowing background/foreground setting on root .katex
        -ms-high-contrast-adjust: none !important;

        // Insulate fraction bars and rules from CSS that sets border-color.
        border-color: currentColor;
    }

    .katex-version::after {
        content: @version;
    }

    .katex-mathml {
        /* Accessibility hack to only show to screen readers
         Found at: http://a11yproject.com/posts/how-to-hide-content/ */
        position: absolute;
        clip: rect(1px, 1px, 1px, 1px);
        padding: 0;
        border: 0;
        height: 1px;
        width: 1px;
        overflow: hidden;
    }

    .katex-html {
        /* \newline is an empty block at top level, between .base elements */
        > .newline {
            display: block;
        }
    }

    .base {
        position: relative;
        display: inline-block;
        white-space: nowrap;

        // Fix width of containers of negative spaces, working around Chrome bug.
        width: min-content;
    }

    .strut {
        display: inline-block;
    }

    // Text font weights
    .textbf {
        font-weight: bold;
    }

    // Text font shapes.
    .textit {
        font-style: italic;
    }

    // Text font families.
    .textrm {
        font-family: KaTeX_Main;
    }

    .textsf {
        font-family: KaTeX_SansSerif;
    }

    .texttt {
        font-family: KaTeX_Typewriter;
    }

    // Math fonts.
    .mathnormal {
        font-family: KaTeX_Math;
        font-style: italic;
    }

    .mathit {
        font-family: KaTeX_Main;
        font-style: italic;
    }

    .mathrm {
        font-style: normal;
    }

    .mathbf {
        font-family: KaTeX_Main;
        font-weight: bold;
    }

    .boldsymbol {
        font-family: KaTeX_Math;
        font-weight: bold;
        font-style: italic;
    }

    .amsrm {
        font-family: KaTeX_AMS;
    }

    .mathbb,
    .textbb {
        font-family: KaTeX_AMS;
    }

    .mathcal {
        font-family: KaTeX_Caligraphic;
    }

    .mathfrak,
    .textfrak {
        font-family: KaTeX_Fraktur;
    }

    .mathboldfrak,
    .textboldfrak {
        font-family: KaTeX_Fraktur;
        font-weight: bold;
    }

    .mathtt {
        font-family: KaTeX_Typewriter;
    }

    .mathscr,
    .textscr {
        font-family: KaTeX_Script;
    }

    .mathsf,
    .textsf {
        font-family: KaTeX_SansSerif;
    }

    .mathboldsf,
    .textboldsf {
        font-family: KaTeX_SansSerif;
        font-weight: bold;
    }

    .mathitsf,
    .textitsf {
        font-family: KaTeX_SansSerif;
        font-style: italic;
    }

    .mainrm {
        font-family: KaTeX_Main;
        font-style: normal;
    }

    // This value is also used in fontMetrics.js, if you change it make sure the
    // values match.
    @ptperem: 10;
    @nulldelimiterspace: (1.2em / @ptperem);

    @muspace: 0.055556em;       // 1mu
    @thinspace: 0.16667em;      // 3mu
    @mediumspace: 0.22222em;    // 4mu
    @thickspace: 0.27778em;     // 5mu

    .vlist-t {
        display: inline-table;
        table-layout: fixed;
        border-collapse: collapse;
    }

    .vlist-r {
        display: table-row;
    }

    .vlist {
        display: table-cell;
        vertical-align: bottom;
        position: relative;

        > span {
            display: block;
            height: 0;
            position: relative;

            > span {
                display: inline-block;
            }

            > .pstrut {
                overflow: hidden;
                width: 0;
            }
        }
    }

    .vlist-t2 {
        margin-right: -2px;
    }

    .vlist-s {
        // This cell solves Safari rendering problems. It has text content, so
        // its baseline is used for the table. A very small font avoids line-box
        // issues; absolute units prevent user font-size overrides from breaking
        // rendering. Safari refuses to make the box zero-width, so we give it
        // a known width and compensate with negative right margin on the
        // inline-table. To prevent the "width: min-content" Chrome workaround
        // from shrinking this box, we also set min-width.
        display: table-cell;
        vertical-align: bottom;
        font-size: 1px;
        width: 2px;
        min-width: 2px;
    }

    .vbox {
        display: inline-flex;
        flex-direction: column;
        align-items: baseline;
    }

    .hbox {
        display: inline-flex;
        flex-direction: row;
        width: 100%;
    }

    .thinbox {
        display: inline-flex;
        flex-direction: row;
        width: 0;
        max-width: 0; // necessary for Safari
    }

    .msupsub {
        text-align: left;
    }

    .mfrac {
        > span > span {
            text-align: center;
        }

        .frac-line {
            display: inline-block;
            width: 100%;
            border-bottom-style: solid;
        }
    }

    // Prevent Chrome from disappearing frac-lines, rules, etc.
    .mfrac .frac-line,
    .overline .overline-line,
    .underline .underline-line,
    .hline,
    .hdashline,
    .rule {
        min-height: 1px;
    }

    .mspace {
        display: inline-block;
    }

    .llap,
    .rlap,
    .clap {
        width: 0;
        position: relative;

        > .inner {
            position: absolute;
        }

        > .fix {
            display: inline-block;
        }
    }

    .llap > .inner {
        right: 0;
    }

    .rlap > .inner,
    .clap > .inner {
        left: 0;
    }

    .clap > .inner > span {
        margin-left: -50%;
        margin-right: 50%;
    }

    .rule {
        display: inline-block;
        border: solid 0;
        position: relative;
    }

    .overline .overline-line,
    .underline .underline-line,
    .hline {
        display: inline-block;
        width: 100%;
        border-bottom-style: solid;
    }

    .hdashline {
        display: inline-block;
        width: 100%;
        border-bottom-style: dashed;
    }

    .sqrt {
        > .root {
            /* These values are taken from the definition of `\r@@t`,
             `\mkern 5mu` and `\mkern -10mu`. */
            margin-left: 5*@mu;
            margin-right: -10*@mu;
        }
    }

    .sizing,
    .fontsize-ensurer {
        @size1: 0.5;
        @size2: 0.6;
        @size3: 0.7;
        @size4: 0.8;
        @size5: 0.9;
        @size6: 1;
        @size7: 1.2;
        @size8: 1.44;
        @size9: 1.728;
        @size10: 2.074;
        @size11: 2.488;

        .generate-size-change(@from, @to) {
            &.reset-size@{from}.size@{to} {
                @sizeFromVariable: ~"size@{from}";
                @sizeToVariable: ~"size@{to}";

                font-size: (@@sizeToVariable / @@sizeFromVariable) * 1em;
            }
        }

        .generate-to-size-change(@from, @currTo) when (@currTo =< 11) {
            .generate-size-change(@from, @currTo);

            .generate-to-size-change(@from, (@currTo + 1));
        }

        .generate-from-size-change(@currFrom) when (@currFrom =< 11) {
            .generate-to-size-change(@currFrom, 1);

            .generate-from-size-change((@currFrom + 1));
        }

        .generate-from-size-change(1);
    }

    .delimsizing {
        &.size1 { font-family: KaTeX_Size1; }
        &.size2 { font-family: KaTeX_Size2; }
        &.size3 { font-family: KaTeX_Size3; }
        &.size4 { font-family: KaTeX_Size4; }

        &.mult {
            .delim-size1 > span {
                font-family: KaTeX_Size1;
            }

            .delim-size4 > span {
                font-family: KaTeX_Size4;
            }
        }
    }

    .nulldelimiter {
        display: inline-block;
        width: @nulldelimiterspace;
    }

    .delimcenter {
        position: relative;
    }

    .op-symbol {
        position: relative;

        &.small-op {
            font-family: KaTeX_Size1;
        }

        &.large-op {
            font-family: KaTeX_Size2;
        }
    }

    .op-limits {
        > .vlist-t {
            text-align: center;
        }
    }

    .accent {
        > .vlist-t {
            text-align: center;
        }

        .accent-body {
            position: relative; // so that 'left' can shift the accent
        }

        // Accents that are not of the accent-full class have zero width
        // (do not contribute to the width of the final symbol).
        .accent-body:not(.accent-full) {
            width: 0;
        }
    }

    .overlay {
        display: block;
    }

    .mtable {
        .vertical-separator {
            display: inline-block;
            // margin and border-right are set in JavaScript
            min-width: 1px;  // Prevent Chrome from omitting a line.
        }

        .arraycolsep {
            display: inline-block;
        }

        .col-align-c > .vlist-t {
            text-align: center;
        }

        .col-align-l > .vlist-t {
            text-align: left;
        }

        .col-align-r > .vlist-t {
            text-align: right;
        }
    }

    .svg-align {
        text-align: left;
    }

    svg {
        display: block;
        position: absolute; // absolute relative to parent
        width: 100%;
        height: inherit;

        // We want to inherit colors from our environment
        fill: currentColor;
        stroke: currentColor;

        // But path elements should not have an outline by default
        // that would make them bigger than we expect.
        path {
            stroke: none;
        }

        // And we don't want to inherit any other style properties
        // that could affect SVG rendering without affecting font
        // rendering. So we reset these properties to their default
        // values for every <svg> element.
        // See https://www.w3.org/TR/SVG/painting.html
        fill-rule: nonzero;
        fill-opacity: 1;
        stroke-width: 1;
        stroke-linecap: butt;
        stroke-linejoin: miter;
        stroke-miterlimit: 4;
        stroke-dasharray: none;
        stroke-dashoffset: 0;
        stroke-opacity: 1;
    }

    img {
        border-style: none;
        min-width: 0;
        min-height: 0;
        max-width: none;
        max-height: none;
    }

    // Define CSS for image whose width will match its span width.
    .stretchy {
        width: 100%;
        display: block;
        position: relative;
        overflow: hidden;

        &::before,
        &::after {
            content: "";
        }
    }

    // Hide the long tail of a stretchy SVG.
    .hide-tail {
        width: 100%;          // necessary only to get IE to work properly
        position: relative;   // ditto
        overflow: hidden;     // This line applies to all browsers.
    }

    .halfarrow-left {
        position: absolute;
        left: 0;
        width: 50.2%;
        overflow: hidden;
    }

    .halfarrow-right {
        position: absolute;
        right: 0;
        width: 50.2%;
        overflow: hidden;
    }

    .brace-left {
        position: absolute;
        left: 0;
        width: 25.1%;
        overflow: hidden;
    }

    .brace-center {
        position: absolute;
        left: 25%;
        width: 50%;
        overflow: hidden;
    }

    .brace-right {
        position: absolute;
        right: 0;
        width: 25.1%;
        overflow: hidden;
    }

    // Lengthen the extensible arrows via padding.
    .x-arrow-pad {
        padding: 0 0.5em;
    }

    .cd-arrow-pad {
        padding: 0 0.55556em 0 0.27778em;  // \;{#1}\;\;
    }

    .x-arrow,
    .mover,
    .munder {
        text-align: center;
    }

    .boxpad {
        padding: 0 0.3em;              // \fboxsep = 3pt
    }

    .fbox,
    .fcolorbox {
        box-sizing: border-box;
        border: 0.04em solid;         // \fboxrule = 0.4pt
    }

    .cancel-pad {
        padding: 0 0.2em;            // ref: cancel package  \advance\dimen@ 2\p@ %  "+2"
    }

    .cancel-lap {
        margin-left: -0.2em;    // \cancel does not affect horizontal spacing.
        margin-right: -0.2em;   // Apply negative margin to correct for 0.2em padding
    }                           // inside the \cancel group.

    .sout {
        border-bottom-style: solid;
        border-bottom-width: 0.08em;
    }

    .angl {
        // from package actuarialangle, which is always used in a subscript.
        box-sizing: border-box;
        border-top: 0.049em solid;        // defaultRuleThickness in scriptstyle
        border-right: 0.049em solid;      // ditto
        margin-right: 0.03889em;          // 1 mu
    }

    .anglpad {
        padding: 0 0.03889em;             // pad 1mu left and right (in scriptstyle)
    }

    .eqn-num::before {
        counter-increment: katexEqnNo;
        content: "(" counter(katexEqnNo) ")";
    }

    .mml-eqn-num::before {
        counter-increment: mmlEqnNo;
        content: "(" counter(mmlEqnNo) ")";
    }

    .mtr-glue {
        width: 50%;
    }

    .cd-vert-arrow {
        display: inline-block;
        position: relative;
    }

    .cd-label-left {
        display: inline-block;
        position: absolute;
        right: calc(50% + 0.3em);
        text-align: left;
    }

    .cd-label-right {
        display: inline-block;
        position: absolute;
        left: calc(50% + 0.3em);
        text-align: right;
    }
}

.katex-display {
    display: block;
    margin: 1em 0;
    text-align: center;

    > .katex {
        display: block;
        text-align: center;
        white-space: nowrap;

        > .katex-html {
            display: block;
            position: relative;

            > .tag {
                position: absolute;
                right: 0;
            }
        }
    }
}

// Left-justified tags (default is right-justified)
.katex-display.leqno > .katex > .katex-html > .tag {
    left: 0;
    right: auto;
}

// Flush-left display math
.katex-display.fleqn > .katex {
    text-align: left;
    padding-left: 2em;
}

// Automatic equation numbers for some environments.
// Use parallel counters for HTML and MathML.
body {
    counter-reset: katexEqnNo mmlEqnNo;
}